Belt shifter



Feb. 28, 1950 M LEACH 2,499,273

BELT SHIFTER Filed Dec. 29, 1945 lNvENToR Mx c? an@ ATTORNEYS Patented Feb. 28,; 1950 1 PAreNr OFFICE 'Maxim-sash;rmviaeneajn. 1.',assilgnnr Mitmach .Machmeryriifb.,atcurporationcf.Rhodelslan nppiieatiun'neeeiherzs, :1945, semina .63 $01014 l"'ticularly .adapted to 'be used infieombination4 withV table.

'One obe'ct'ofthis `inventinniiis 1.the provisionfof .a `.polishimg latherwith a "beltfshi'fter,formed-fas 'anintegral `part ofthe lathe.

Another object of the invention is the provision of a belt shifter which will be operable from `a location in front of the lathe.

Another object of the invention is the provision of a belt shifter wholly enclosed within the spindle housing support.

Another object of the invention is the provision of a belt shifter wholly enclosed within the spindle housing support with means. on the outside of the housing support to indicate the relative positions of the belt shifter. Another object of the invention is ,the provision of a belt shifter wherein the limit of movement thereof in each direction will-becontrolled without the use ofstops or adjustments'.

With these and other objects in '.view, the invention consists of certain novel features of construction, as will be more fully describedland particularly pointed out in the appended-claims.

In the accompanying drawings:

Fig. 1 is a front elevational view of L,-apolishing lathe embodying my invention;

Fig. 2 is a sectional view taken substantially along lines 2-2 of Fig. 1;

Fig. 3 is a perspective View of the 1belt shifter and the means for swinging the same about its pivot.

In carrying out my invention, I provide a lever having a bifurcated end portion providing arms between which the belt passes. This lever is pivotally mounted on the front wall of the spindle housing. In order to swing the lever so as to move the belt from one pulley to the other, I provide a crank arm which I pivotallymount on the front wall and extend `the .pivot thereof through the wall and attach a handle thereto to manually rock the crank.

' fabienne; (owne-242i) ring L'from the "rear -wall` i2.

'Referring -`to "the drawings `for -a :fm'ore l"detailed fdesorip'tionof 'theinventiom IIJ designates gen@ `erally a housing bearing support having iront, rear, and side walls, I I, I2', `and 'I 3"respective`ly. 'The fside ywalls mountA `bearings I 4"*fin which 'there -is'suitably journaled a spindle l5. The spindle '-extendsbeyondthe -s'ide Lwalls-of the `housing and has the end portions I 6 thereof formed so as "to receive'a polishing `Wheel or like device. lA closurell is hinged asat I8 on a boss I9 extend- The iront portion of this coverjis 'provided with a A'lip 20 which"is l.engageable` to vsvving the Acover about' the hinge ffor"'access tothejparts lwithin Ithe housing.

VThe `'spindle is "beltdriven land'is aprovided with 'tightandloose pulleys 2I '22 suitably mounted on the spindle at a location to be enclosed 4within "the housing III. 'An endless'be'lt 23 is trained about the pulleys and extends from a drive pulley beneath the housing (not shown).

In order to shift or move the belt from one pulley to the other, I provide a lever 24 having a boss 25 apertured as at 26 to receive a pivot pin 21, which extends from the wall Il. The upper end portion of the lever is bifurcated as at 28 providing similar spaced arms 29. These arms extend generally at right angles from the body of the lever in a direction toward and beyond the belt which is trained over the pulleys. The belt 23 passes between these arms and is moved from one pulley to the other thereby. These arms are provided with a curved surface 30 so as to provide a point contact with the belt when moving the same from one pulley to another. To swing the lever 24 about the pivot 21 I provide a manually operable handle 3| which has a shaft 32 extending through the wall I l in rotative relation therewith. I mount on this shaft a crank 33 by means of a screw 34. This crank has an extension here shown in the form of a pin 35 which is received in an elongated s'lot 36 provided in th lever 24.

The handle 3| is manually turned and has opposite arms 38, 39. 33 on the shaft 32, the arms 38, 39 are positioned to be horizontal and the crank so located on th vshaft 32 as to have the axis of the pin 35 intersect and axes of the arms 38, 39. This will position the pin 35 at the limit of throw of the crank 33 which will also be the limit of swing of lever 24 in one direction. An indicating mark which may take the form of an arrow 40 is placed on onev of the arms ocE the handle so that when the 'arms are in a horizontal position the relative position When mounting the crank.

3 of the belt may be determined prior to placing the power source in action.

It will be apparent that as the handle is rotated in one direction, the crank 33 will be rotated with the shaft 32 in the same direction and through the pin 35 will swing the lever about thel pivot pin 21 to move the belt from one pulley to the other as the case may be.

I claim:

1. A belt shifter comprising a bifurcated pivoted lever providing spaced arms between which the belt passes, said lever having an elongated opening extending longitudinal thereof lat a location thereon intermediate the ends thereof and means including an eccentrically mounted pin received in said opening and movable therein and operable for swinging said lever about its pivotal mounting for shifting the belt from one pulley to the other.

2. A belt shifter comprising a pivoted lever having right angularly extending spaced arms at one end thereof between which the belt passes, said lever having an elongated opening extending longitudinal thereof at a location thereon intermediate the ends thereof, and rockable means including a pin slidably received in said opening operable for swinging said lever about its pivoted mounting for shifting the belt from one pulley to lthe other.

3. A belt shifter comprising a bifurcated pivoted lever providing spaced arms between which the belt passes, said lever having an elongated opening extending longitudinal thereof at a location thereon intermediate the ends thereof, and a. crank pivotally mounted adjacent said lever and having a pin extending therefrom received in said opening for swinging the lever about its pivoted mounting upon movement of the crank.

4. In a machine tool having an upright wall providing a support, a belt shifter having a body portion pivotally mounted at the lower end thereof to said support in spaced relation therewith, said body portion having an opening therein intermediate the ends thereof, a crank pivotally mounted to said support and extending therefrom in the space between said support and said lbody and having a projection thereof extending into said opening and slidably engaging the walls thereof for swinging the belt shifter about its mounting upon movement of the crank.

5. In .a machine tool having an upright wall providing a support, a belt shifter having a body portion pivotally mounted at the lower end thereof to said support in spaced relation therewith, said body portion having an opening therein intermediate the ends thereof, a crank pivotally mounted to said support and extending therefrom in the space between said support and said body and having a projection thereof extending into said opening and slidably engagingv the walls thereof for swinging the belt shifter about its mounting upon movement of the crank, and a handle extending on the opposite side of said support and secured to said crank for rocking the same about its mounting. v

MAX LEACH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 782,350 Moore Feb. 14, 1905 1,928,966 Reed June 11, 1912 1,670,139 Cockburn May l5, 1928 2,293,391 Hepburn Aug. 18, 1942 

